Week 5 to 8 lecture slides Flashcards
(32 cards)
What are the 3 basic transport measures?
Capacity (C; i.e. people/hr)
Throughput (Q; actual volume)
Demand (D; number of desired)
What is utilization?
the percentage of capacity that is represented by throughput
numbers for below capacity, approaching capacity; and exceeding capacity
below: v/c<0.75
approaching: v/c= 0.75~1
exceeding: v/c>1
plan according to the 85th percentile
What are some basic transport measures?
utilization; density; reliability; safety; environmental performance; sustainability performance; socio-economic performance
what are the 7 principles for selecting performance measures?
comprehensive; data quality; comparable;
easy to understand; accessible and transparent; cost effective.
what are the 3 components of an auto-based system?
Vehicles; ways; facilities
What are some impacts on the roads that vehicles can make?
size determines the width of way.
mass determines construction material.
speed determines road curvature and compatibility with other modes.
how are ways classified?
Function
Access
Speed (designed vs observed)
Capacity
What are some of the considerations for road design?
Design vehicle
Design speed
Curves (verticle and horizontal)
Why are intersections important?
Focus of activity
Conflicting movements
Traffic control
Capacity
What’s the key intersection design challenge?
Efficiency vs safety
What level of service are intersections designed for during peak hours?
D
How do we choose design speed?
Road function
Compatibility with surroundings
Integration in the transport network
What changes are made to the 85th percentile?
Engineers used to just accommodate the 85th percentile, even if it’s faster than desired. but now, they are trying to reduce the 85th percentile.
What are facilities?
regulatory instruments (i.e. signs and signals) determines how vehicles are legally allowed to operate along ways
What are the intentions of traffic calming?
To remake the roads to make them more compatible with other modes and intended functions.
What are some examples of traffic calming methods?
Narrowing lanes (specifically at intersections)
Speed tables
Materials
Why did many oppose the GTA west corridor?
Not viewed as necessary Negative impacts on watersheds Loss of arable land Opportunity lost-less money for transit Only saves 30 sec/trip
What other options were proposed instead of the GTA west corridor?
Congestion pricing
Hwy 407 truck lanes
Land use management
What are some concerns cities have in terms of autonomous vehicles?
Will they encourage sprawl? Who will have access to these AVs? What regulatory changes are required? Should AVs get into accidents, who's accountable? Ownership vs share?
What are some concerns transport agencies have in terms of AVs?
will streets need to be redesigned?
how will this affect public transport?
What are some concers developers have in terms of AVs?
Parking?
how will AVs affect congestion?
What are the different levels of autonomous vehicles?
lvl 3-driver in charge of emergency response, and doesnt function in all contexts.
lvl 4-doesnt function in all contexts
lvl 5- all autonomous!
What are some characteristcs of public transportation?
Shared passenger service available to all who can pay the fare.
Discrete departure and arrival times (fixed schedule)
Limited stop locations
Predetermined routes
Greater vehicle capacity
